Version history for Langbein, John, 2006, Evaluation of some software measuring displacements using GPS in real-time: U.S. Geological Survey Open-File Report 2006-1235 [available on the World Wide Web at http://pubs.usgs.gov/of/2006/1235/ ]. Version 1.0, October 19, 2006 Initial release online at http://pubs.usgs.gov/of/2006/1235/